It selects the items that make up the statistics index file defined in the field Stat. Index.
It selects the items that make up the selected entity file in the field Entity.
It performs the updating of the apportionment group row factors based on formulas entered for each row.
It updates the apportionment groups factors that use formulas according to parameters: Start Group?, End Group? and Update Apportionments?.
It identifies the apportionment groups status.